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  1. Two point white dots are 1 mm apart on a black paper.
  2. When two displacements represented by y₁=a sin(?t) are superimposed the motion is
  3. A particle A suffers on oblique elastic collision with a particle B that
  4. For a given velocity, a projectile has the same range R for two angles of projection.
  5. A particle of mass m oscillates along x-axis according to equation x = a sin ?t